Answer:
Sedimentary rock: they are soft and made up of layers called strata.
Metaphoric rocks: They are crystalline and crystals within it are arranged in bands.
Igneous rocks: They are made of crystals( the size of the crystals depend on how fast the rocks cool). They usually don't react with acids, and they can be fine-grained, or glassy( like Obsidian)
Explanation:
<span>The Storm and Stress movement happened in the eighteenth century. This was a German literary movement used to overthrow the enlightenment cult of rationalism. The two most prominent writers during this time were Johann Wolfgang Goethe and Friedrich Schiller.</span>
The object must move with the speed of 
times to approximately seeing that it is contracted to exactly half of its actual length.
<h3>How is this calculated?</h3>
The length contraction experimented by the object as it approaches lightspeed, in meters per second, is described by Lorentz contraction formula:
Here, v is the current speed m/s
c is the speed of light in m/s
L' is the length of the object at rest in m
L is the length of the object at the current speed in m
Now we know that
and 
then,
Hence, r = 
Therefore, the answer is the object must travel at a speed of times the lightspeed to be contracted to one-half its proper length.
To know more about the Lorentz contraction formula, visit:
brainly.com/question/17407131
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